TL;DR
- Construction is second only to manufacturing in foreign-worker injury counts (17.6%). "They didn't understand the language" is not an excuse.
- A construction site requires three layers of training: on-hire training (employer), send-off training (subcontractor), and new-entrant training (the prime contractor's responsibility).
- The 5 walls you hit on site are: language, culture, schedule time, responsibility split, and records.
- Multilingualization is not just "translation" — confirming comprehension is essential. Court rulings on breach of the duty of care for safety are increasing.
- The prime contractor is responsible for keeping subcontractors' training records for 3 years.
Foreign workers in construction now exceed 100,000 — they are an indispensable part of the workforce. At the same time, in MHLW's Reiwa 6 statistics, construction accounts for 17.6% of foreign-worker injuries, ranking second after manufacturing (48.3%).
To put it bluntly, on-site safety training has historically been built on a "Japanese-speaker default" — it needs to be redesigned for foreign workers. This article organizes the five walls that site managers and prime contractor staff most often hit, and shows the path to clearing each one.
1. The "three layers of training" on a construction site
Before anything else, let's lay out the structure of safety training in construction. Lumped under one label it's easy to miss, but a site actually has three layers.
| Layer | Training name | Who runs it | Legal basis |
|---|---|---|---|
| 1 | On-hire safety and health training | The employing company (incl. subcontractors) | ISHA Article 59, paragraph 1 |
| 2 | Send-off training | The sending subcontractor | Industry practice / prime contractor request |
| 3 | New-entrant training | The prime contractor | ISHA Article 30 |
On-hire training is a one-time induction by the hiring company; send-off training is the pre-site briefing a subcontractor gives before sending workers; new-entrant training is the prime contractor explaining that specific site's rules. For foreign workers, all three layers must be delivered in a language they understand.
Easy for prime contractors to miss
On-hire training is often assumed to be "the subcontractor's job," but new-entrant training is the prime contractor's responsibility. Article 30 of the 労働安全衛生法 imposes the duty of integrated safety and health management on the prime contractor, including the workers of related subcontractors.
2. Wall 1: Language — the trap of "they speak Japanese, so we're fine"
The most common misconception on site is "as long as they can hold a conversation in Japanese, they'll understand safety training." That assumption is, in fact, a recurring cause of serious accidents.
The gap between everyday conversation and specialized terms
"足場 (scaffolding)," "親綱 (lifeline)," "玉掛け (rigging/slinging)," "KY活動 (hazard prediction activities)," "ヒヤリハット (near-miss)" — these are job-specific terms you won't learn from everyday Japanese conversation. Even an N3–N4-level Japanese speaker may not understand the specialized vocabulary.
"Understanding Japanese" and "understanding the Japanese needed to avoid danger" are different abilities. Safety training should be evaluated on the latter.
Solution: native language + plain Japanese hybrid
- Core training material: the worker's native language (Vietnamese, Chinese, English, Indonesian, etc.).
- On-site signage and instructions: plain Japanese (やさしい日本語) + pictograms.
- Emergency keywords: unified in Japanese ("危ない！" "止まれ！").
Make sure they really understand in their native language, then align day-to-day site operation on a minimum set of Japanese terms — that two-layer setup is the realistic approach.
3. Wall 2: Culture and religion — "they should know without being told" doesn't work
Safety culture in a worker's home country can differ significantly from Japan's. Wearing a helmet and safety shoes at all times, KY hazard prediction, and 4S (sorting, setting in order, shining, standardizing) — these "common sense" practices on Japanese sites are not universal.
Common mismatches
- People from cultures that prize "deciding and acting on your own" may start work without waiting for instructions.
- In cultures where "asking questions is shameful," workers may proceed without clarifying what they don't understand.
- Muslim workers fasting during Ramadan lose concentration over long fasts. Heat illness risk also rises.
The point is, these are not "training deficits" but "cultural differences." Don't get angry — write the site rules down explicitly and share them.
4. Wall 3: Schedule time — "we can't carve out the time for new-entrant training"
Standard new-entrant training runs 30 minutes to 1 hour, but using an interpreter or native-language materials for foreign workers stretches it to 1.5× to 2× the time. On short-deadline sites, finding that time is a real headache.
Solution: split into pre-learning + on-site verification
Step 1: Move pre-learning to native-language e-learning
Have workers watch site-rule videos in their native language the day before arrival, at the subcontractor's office or dormitory. Run comprehension tests online too.
Step 2: On-site, narrow it down to 'verification'
On the day, spend about 15 minutes on site-specific information: evacuation routes, hazardous areas, today's work scope. Treat pre-learning as a prerequisite.
Step 3: Make comprehension checks visible with a checklist
Use a native-language checklist of items to verify by demonstration, such as "fastening the helmet chin strap" and "connecting to the lifeline." Don't let it be a read-and-done exercise.
If pre-learning is handled via e-learning, you can compress the on-site time. It's a reasonable division of work for both the prime contractor and the subcontractor.
5. Wall 4: The prime/subcontractor responsibility split
"Training is the subcontractor's job — why does the prime contractor have to do it?" You hear this often on site. That said, look at how the law is structured and the reason is clear.
On-hire training vs. new-entrant training
| Training | Responsibility | Target | Content |
|---|---|---|---|
| On-hire training (ISHA Art. 59) | Employer (subcontractor) | Newly hired workers | General work safety and health |
| New-entrant training (ISHA Art. 30) | Prime contractor | Everyone entering that site | Site-specific rules |
On-hire training is the responsibility of the company that hired the person; new-entrant training is the responsibility of the prime contractor overseeing the site. Both are required — one alone is not enough.
Case law on the duty of care for safety
In recent court cases involving foreign worker accidents, courts have increasingly found employers in breach of the duty of care for safety (安全配慮義務) when they "knew the worker could not read Japanese, yet failed to provide training in the worker's native language." The prime contractor bears the same duty, so leaving everything to the subcontractor does not provide an exemption.
6. Wall 5: Records — "we did it, but the paperwork is missing"
The last wall is retaining training records. Honestly, on a real site, "I remember doing it, but I don't know where the paper went" is a routine occurrence.
Legal requirements
| Record | Retention period | Custodian |
|---|---|---|
| On-hire training records | 3 years | Employer (subcontractor) |
| New-entrant training records | 3 years | Prime contractor |
| Special training records | 3 years | Employer (subcontractor) |
The difficulty of running this on paper
On construction sites, workers come and go quickly, and paper-based records for former workers tend to get lost. If you can't produce records during a Labour Standards Inspection Office visit or a prime contractor audit, it becomes evidence weighing against you on duty of care.
Three benefits of digitization
- Records are tied to each learner (massively reduced loss risk).
- The prime contractor can share an at-a-glance training status with subcontractors.
- You can produce evidence instantly when an inspector visits or — in the worst case — an accident occurs.
7. Clearing all 5 walls in one motion
Rather than knocking down the walls one by one, there's a sequence that lets you clear them in one motion. Here is the on-site implementation order.
Step 1: Have your training materials ready in 5 languages
Set Japanese, English, Vietnamese, Chinese, and Indonesian as your minimum baseline. Localize on-hire training, new-entrant training, and special training (for the relevant tasks) — all of them.
Step 2: Move pre-learning into e-learning
Make the standard new-entrant content something workers can take at the subcontractor's dormitory or office before arriving on site. This compresses on-site time.
Step 3: On the day, verify only site-specific information
Narrow it down to about 15 minutes: evacuation routes, today's work scope, and a hazard map — written in plain Japanese alongside the native language.
Step 4: Centralize records
Use a dashboard that both subcontractors and the prime contractor can see, with each worker's training status visible at a glance. Automate the 3-year retention as well.
Step 5: Keep evidence for the duty of care for safety
In the unfortunate event of an accident, leave evidence that you "delivered training in a language the worker understood." Attendance logs and completion-test pass records are key.
8. Connecting to related training
When you receive foreign workers on a construction site, special training is required for certain tasks in addition to on-hire and new-entrant training. Full-harness fall-arrest equipment, rigging/slinging, small cranes, and scaffold assembly are typical examples.
Special training is a separate obligation from on-hire training. It must be completed before workers are assigned to the relevant tasks.
9. Summary
Safety training for foreign workers in construction has moved past the era when "leave it to the subcontractor" sufficed. The prime contractor's overall responsibility, the duty of care for safety, native-language new-entrant training — leaving any one of these gaps preserves the risk in the event of an accident.
The 5 walls aren't solved one at a time. By moving multilingual content, pre-learning, and digital recordkeeping forward together, you clear them all at once.
Key Takeaways
- Construction accounts for 17.6% of foreign-worker accidents. "Speaks Japanese" and "can avoid danger" are different abilities.
- Three layers of training are required (on-hire / send-off / new-entrant). New-entrant training is the prime contractor's responsibility.
- Five walls = language, culture, schedule time, responsibility split, records. Handle with native-language content + plain Japanese + pictograms.
- For new-entrant training, moving pre-learning to e-learning and limiting the on-site session to site-specific information is the realistic approach.
- Case law on prime-contractor breach of the duty of care for safety is increasing. 3-year digital retention is now a prerequisite.
Related articles
- Foreign Worker Safety & Health Training: The Complete Guide
- On-Hire Safety & Health Training: The Complete Guide
- Multilingual Special Training: The Complete Guide
Primary references
- Industrial Safety and Health Act Articles 30 and 59 (e-Gov Legal Search)
- Status of Industrial Accidents in Reiwa 6 | MHLW
- Materials for Foreign Workers in Construction | MHLW
- Acceptance of Foreign Workers in the Construction Sector | MLIT
- Common Text for Safety & Health Training for Foreign Workers (Construction) | MHLW